Listening for Dark Photon Radio from the Galactic Centre

Understand

Dark photon dark matter that has a kinetic mixing with the Standard Model photon can resonantly convert in environments where its mass $m_{A'}$ coincides with the plasma frequency.

• We show that such conversion in neutron stars or accreting white dwarfs in the galactic centre can lead to detectable radio signals.
• Depending on the dark matter spatial distribution, future radio telescopes could be sensitive to values of the kinetic mixing parameter that exceed current constraints by orders of magnitude for $m_{A'} \in \left(6\times 10^{-6},7\times 10^{-4}\right)$ eV.